:root {
  --bg: #f4f6f8;
  --surface: #ffffff;
  --surface-muted: #f1f3f5;
  --text: #202223;
  --subdued: #616161;
  --border: #dcdfe4;
  --accent: #0b6f70;
  --accent-strong: #075e60;
  --radius: 12px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

a {
  color: var(--accent);
  text-decoration: none;
}

.docs-shell {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
}

.docs-header {
  background: linear-gradient(135deg, #063f40, #0b6f70);
  color: #ffffff;
  padding: 56px 0;
}

.header-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(260px, 0.6fr);
  gap: 32px;
  align-items: end;
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--accent);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.docs-header .eyebrow,
.docs-header .header-copy {
  color: rgba(255, 255, 255, 0.82);
}

h1,
h2 {
  margin: 0;
  line-height: 1.16;
}

h1 {
  max-width: 780px;
  font-size: clamp(36px, 5vw, 64px);
  letter-spacing: -0.04em;
}

h2 {
  font-size: clamp(24px, 3vw, 34px);
  letter-spacing: -0.025em;
}

.header-copy {
  max-width: 720px;
  margin: 18px 0 0;
  font-size: 18px;
}

.header-card {
  border: 1px solid rgba(255, 255, 255, 0.25);
  border-radius: var(--radius);
  padding: 22px;
  background: rgba(255, 255, 255, 0.08);
}

.header-card p {
  margin: 8px 0 0;
  color: rgba(255, 255, 255, 0.78);
}


.docs-layout {
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr);
  gap: 28px;
  padding: 32px 0 64px;
}

.docs-nav {
  position: sticky;
  top: 16px;
  align-self: start;
  display: grid;
  gap: 4px;
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
}

.docs-nav a {
  padding: 10px 12px;
  border-radius: 8px;
  color: var(--subdued);
  font-weight: 600;
}

.docs-nav a.active,
.docs-nav a:hover {
  background: #e4f4f4;
  color: var(--accent-strong);
}

.docs-content {
  display: grid;
  gap: 18px;
}

.doc-section {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  padding: clamp(22px, 4vw, 36px);
}

.doc-section p {
  margin: 14px 0 0;
  color: var(--subdued);
}

.doc-section ol,
.doc-section ul {
  margin: 18px 0 0;
  padding-left: 22px;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-top: 22px;
}

.feature-grid.two-column {
  grid-template-columns: repeat(2, 1fr);
}

.feature-grid div,
.qa-list div {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px;
  background: var(--surface-muted);
}

.settings-table {
  display: grid;
  overflow: hidden;
  margin-top: 22px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.settings-table div {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 18px;
  padding: 16px;
  background: var(--surface);
}

.settings-table div:nth-child(even) {
  background: var(--surface-muted);
}

.settings-table div + div {
  border-top: 1px solid var(--border);
}

.settings-table span {
  color: var(--subdued);
}

.feature-grid span {
  display: block;
  margin-top: 4px;
  color: var(--subdued);
}

.flow {
  display: grid;
  grid-template-columns: 1fr 24px 1fr 24px 1fr 24px 1fr;
  gap: 8px;
  align-items: center;
  margin-top: 22px;
}

.flow div {
  padding: 14px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface-muted);
  text-align: center;
  font-weight: 700;
}

.flow span {
  height: 2px;
  background: var(--accent);
}

.sketch {
  margin-top: 22px;
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: #f8fafb;
}

.browser {
  display: flex;
  gap: 6px;
  padding: 10px;
  border-bottom: 1px solid var(--border);
  background: #eef1f3;
}

.browser span {
  width: 10px;
  height: 10px;
  border-radius: 999px;
  background: #b9c0c8;
}

.product-sketch {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 18px;
  padding: 22px;
}

.image-box {
  display: grid;
  min-height: 150px;
  place-items: center;
  border: 1px dashed #98a2ad;
  border-radius: 10px;
  color: var(--accent);
  font-size: 32px;
  font-weight: 800;
}

.line {
  width: 60%;
  height: 12px;
  margin-bottom: 14px;
  border-radius: 999px;
  background: #d7dde3;
}

.line.wide {
  width: 86%;
}

button {
  border: 0;
  border-radius: 8px;
  background: #202223;
  color: #ffffff;
  padding: 12px 18px;
  font-weight: 700;
}

.qa-list {
  display: grid;
  gap: 12px;
  margin-top: 18px;
}

@media (max-width: 900px) {
  .header-grid,
  .docs-layout,
  .feature-grid,
  .feature-grid.two-column,
  .product-sketch {
    grid-template-columns: 1fr;
  }

  .settings-table div {
    grid-template-columns: 1fr;
    gap: 6px;
  }

  .docs-nav {
    position: static;
    grid-template-columns: repeat(2, 1fr);
  }

  .flow {
    grid-template-columns: 1fr;
  }

  .flow span {
    width: 2px;
    height: 18px;
    margin: 0 auto;
  }
}

@media (max-width: 560px) {
  .docs-shell {
    width: min(100% - 20px, 1180px);
  }

  .docs-header {
    padding: 34px 0;
  }

  .docs-nav {
    grid-template-columns: 1fr;
  }
}